Comparison of 12 Ilford and Kodak Unhypered B&W Films

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"The 2 MIN F/STOP LOSS refers to how much sensitivity in F/stops the film lost in a comparison of a normally illuminated 1/8th sec exposure compared to a 128 second exposure at the same illumination level taken through a 1000X (10 F/stop ND 3.0) neutral density filter. (These two exposures are theoretically equal.) The P FACTOR is the film's Swartzchild exponent used for measuring reciprocity law failure with the formula P=1-(s/7) where "s" is the speed loss in F/stops over a given exposure length. The 2 MIN ISO is the film's AVERAGE ISO speed over a two minute exposure, accounting for reciprocity law failure, and rounding to the nearest 1/3 F/stop. Ilford HP 5+ was chosen as the best unhypered B&W film because of its good red and blue sensitivity and moderate reciprocity law failure. Although Kodak's T400CN aparently has similar color response with better reciprocity characteristics, T400CN possesses lower overall image contrast."

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• Tags: film, test, bw, black & white, photography, iso, contrast
• Saved by Fredrik Matheson on December 18, 2007.
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